Tab and Toggle feature

Hi, I'm trying to make a page with several tab-boxes. The first is working perfect, but when I add a second instance of the tab-box it doesn't display the tab content, only the headers. Clicking on the different headers changes the displayed contents in the first instance of the tab-box. I've changed the names of the headers also but it doesn't help. Any advice as to how I can place multiple tabbed boxes on a single page? Thanks, Neil